Magnesitic artificial stone



Patented JuneiSi, 1928.

- Anna. CORPORATION, me; a

- 3-: HQLLIS ALLISON, OF SHREVEPOBT, LGUISIANA, ASSIGiIOR TO ROYAL MUR- COBPORATION OF LOUISIANA.

j maennsrrrc ARTIFICIAL sirorm; Y

Ho Drawing.

My invention relates to the manufacture of artificial stone, and hasfpa-rt cular refer-. ence to the production of a magnesitic arti- In the manufacture of my mproved stone the princi les of the inyent-ion are carriedout as f ows.'Superfin'e Portland cement in the quantity desired is mixed with an 10 equal part by volume of calcined American magnesite and to th s mixture is added onefourth by volume of pulverized alum; The amount of alum employed is to be one-iourth as much as the total amount of the cement and magnesite. These ingredients are well mixed in dry form and to the mixture thus produced is added from one and one-half to two times as much silica, by volume.

' As another step in producing the stone, equal parts by volume of water and flake magnesium chloride are mixed and'to each five gallons of'li uid there is added one ounce of chem ca' y pure sulphuric acid. After foaming has ceased, the foam may be skimmed oil' or otherwise removed from the If uid.

and the mixture stirred until it reaches the approximate consistency of molasses, that is until it becomes thin enough to pour.

A coloring material is made up oifour parts by volume/of calcined magnesite to one-part of'dry mineral'p'aint mixed with a suflicient quantity of the liquid producedas above described, to render the pigment material thin enough to pour.

The. pigment is then added tothe cement 'rnixture and the entire mass is agitated slightly to distribute the igment entirely 40 throughout the mass after w ch e liquid is then added to the dry cement it is'poured nickel plated or polished steel molds of Application filed August 25, 1 926. Serial R0. 131,540..

any desired design pr shape. It should be left in the molds over a period of approximately twelve hours after which the stone will have become firmly set and ready for use.

lhe stone thus produced is hard and nonporous. It hasa natural glaze or polish on its surface, which with the coloring matter, makes it highly desirable as an ornamental element.

The cement is used because of its hardness and it is mixed with magnesite to procure a quick set. The surface polish is caused by.

the .alum .in the composition. Sulphuric ac d is used int-he magnesium chloride for cleamng and bleaching, and to prevent dis colorization in the finished product. The

sand orsilica isof' course the base.

I claim: 3

1. A magnesiticartifi'c'ialstone formed of Portland cement, calcined American mag nesite pulverized alum, and silica mixed in dry form and having-added thereto a l quid containing water, magnesium chloride and sulphuric acid, and a pigmentcarrying material mixed therewit A A magnesit-ic artificial stone comprising equal parts by volume of superfine Portland cement and .calc ned American ma nesite, 10

' pplverizedalum in an amountequal y volume to one fourth theamount of said cement andmagnesite, silica inan amountsubstantially twicebyi volume that of th-comb'ned cement, magnesiteaand alum, a liquid containing sulphuric acid added thereto and apigment material containing. magnesite added to the mixturer A In testimony whereof I have aflixed my signature."

7 Brendan HOLLIS AL ISO 

